Development of Rock Bolt Elements in Two-Dimensional Discontinuous Deformation Analysis

Computer modeling can be used to explore and gain new insights into the impacts of rock bolt intersecting joints in rock masses, and to estimate the effectiveness of the rock reinforcement system. In order to achieve this goal, we couple a rock bolt element into the two-dimensional discontinuous def...

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Bibliographic Details
Published in:Rock mechanics and rock engineering 2014-11, Vol.47 (6), p.2157-2170
Main Authors: Nie, W., Zhao, Z. Y., Ning, Y. J., Sun, J. P.
Format: Article
Language:English
Subjects:
Algorithms
Applied sciences
Buildings. Public works
Civil Engineering
Computation methods. Tables. Charts
Computer simulation
Earth and Environmental Science
Earth Sciences
Exact sciences and technology
Geophysics/Geodesy
Geotechnics
Joining
Mathematical models
Mechanical properties
Original Paper
Rock
Rock (material)
Rock bolts
Rock deformation
Rocks
Shear
Soil mechanics. Rocks mechanics
Stabilization. Consolidation
Structural analysis. Stresses
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Summary:Computer modeling can be used to explore and gain new insights into the impacts of rock bolt intersecting joints in rock masses, and to estimate the effectiveness of the rock reinforcement system. In order to achieve this goal, we couple a rock bolt element into the two-dimensional discontinuous deformation analysis (DDA 2D ) program. The coupling algorithm is based on the analytically-derived interface behavior between a rock bolt and the rock material for grouted rock bolts. The shear force generated by slippage along the interface is assumed to have a linear relationship with respect to the relative slipping distance between the rock bolt and the rock. The linear elastic criterion is applied to determine the material behavior of rock bolts before the axial stress reaches the yield value. The pullout tests are simulated to verify the coupling algorithm and the effects of the proposed rock bolt elements. Parametrical studies are also carried out to analyze the effectiveness of the rock bolts under various end conditions, joint locations and bond stiffness. In addition, the performance of the rock bolt during the interface debonding is analyzed using two types of constitutive laws, i.e., the friction law and the reduction law. The simulation results show that the proposed rock bolt models can predict the shear forces and axial loading along the rock bolts.
ISSN:0723-2632
1434-453X
DOI:10.1007/s00603-013-0525-1